Stylus foe



C. H. GILL.

STYLUS FOR SOUND REPRODUCING MACHINES.

APPLICATION FILED MAY 16, I919.

Patented Feb. 3, 1920.

UNIT STATES PATENT OFFICE.

" "CHARLES H. GILL, or CHICAGO, ILLINOIS.

s'rYLus non scnnn-nnrnonuoine' MACHINES.

7 Application filed ma 16,

To all whomz't may concern:

Be it known that I, Grrnnnns H. GILL, a citizen or the United States, residing at Chicago, in the county ofCook and State of Illinois, have invented new and useful Styli for Sound-Reproducing Machines, of which the following is a specification. I 1

I My invention relates to improvements in styli or needles which are usedin contact with sound records to convey the recorded vibrations to the sound reproducer for reproduction; and the objectsof my improvement are, first, to provide a stylus havin a multi licit of Joints so' that new points may bebrought into operative position as required without the need of inserting anew stylus or needle so frequently; second, to provide supporting and attaching means for said stylus so as to make it available for use on sound reproducing machines of-types now in use; third, to provide means for readily moving a new point intooperative position at will and for indicating to the touch and hearing that such new point has been so moved to operative position; and, fourth, to provide means whereby further changes in the operative point are prevented after all the points on the stylus have been in use.

I attain these objects by the means illustrated in the accompanying drawing, in which- Figure 1 is an enlarged front elevation showing my complete device assembled; Fig. 2 is an enlarged side elevation of the complete device, with the needle wheel shown in cross section; Fig. 3 is an enlarged side elevation, with the needle wheel shown in cross section, similar to Fig. 2, but with the needle wheel and clamping nut in removed position; and Fig. 4 is an enlarged front elevation of the needle wheel only; 7

Referring to the drawings, the needle wheel 11 consists of a disk portion and a number of radial pointed teeth 12, the wheel being also provided with a central opening 1') of circular form. In, the illustrated construction, the teeth 12 are shaped to a" point on all four of their sides but if very thin. material is used in'the construction of the needle wheel 11 the teeth 12 need be shaped to points only in the one direction as shown in Figs. 1 and 4.

The teeth 12 are so spaced apart that the needle wheel 11 can be placed edgewiseupon a sound record. at the correct playing angle r Specification of Letters Patent. t t 3, 9 a

Serial E0. 297,520.

and have] only one of the teeth 12 in operative contact with the record, the remaining teeth clearing the surface of the record.

A'holding or supporting member for the needle'wheel 11 is formed by the rod 14 which is bent at right angles near one of its ends. The end of this rod 14 opposite to the bent end is adapted to be inserted in the usual needle holding device on the reproducing member of a sound reproducing machine and to be fastened or secured in such needle hold-v mg de'vlce by the usual means, generally a set screw with a knurled head.

The bent portion of the rod 14 carries and is surrounded by a. fixed disk 15 spaced away from its end and is threaded to receive an internally threaded nut 16. This nut 16 is provided with a disk part 1'7 and a knurled head 18 and is adapted to be screwed upon the threaded portion of the radia and to friction-ally secure the needle wheel 11 in position. r f

A pawl 19 is pivoted by means of a pin 20 to the upper part of the rod 14: and is pressed by the spring 21 which is secured upon the rod 14: by being bent around it and around the pin 20. The pawl 19 has a hook on its angular face and one of the radial teeth 12 is provided with a notch 23 fitted to receive the hook 22 and lock the needle wheel against rotation in one direction whenever the hook 22 and the notch 23 are in operative proximity to each other.

In operation, the needle wheel 11 is placed upon the holding or supporting member, the threaded portion or the rod 14 passing through the circular opening 13 in the needle wheel 11. The pawl 19 is adjusted so that it is in the position shown in Fig. 1, being in contact with the reverse edge of the tooth 12 provided with the notch 23. The nut 16 is then screwed upon the threaded portion of the rod 14: so as-to firmly press the needle wheel 11 between the fixed disk 15 and the disk part 17 of the nut 16, thus securing the needle wheel 11 against rotation and against any lateral movement. The knurled head 18 of the nut 16 is provided to make easier the screwing on and oil or the nut.

The upper end of the rod 1a is now inserted in the opening of the needle holding device of the sound reproducing machine and the entire stylus is turned so that the into line with the direction of the record;

fiat sides of the needle wheel 11 are brought grooves on the sound record at the point of contact between stylus and recordp The stylus is then made fast to the reproducing member of the 'sounc l' iep'i o'ducing inachine inthe same manner as an "ordinary needleis secured in place, usually by means of a set screw. Afteroneor more records have-been played and'it is desired to use a neWstylus point, the nut- 16 is slightlyloosened and the f position, so the nut 16, is tightened. This 15.

needle wheel 11' is turned in the direction i'peninittedbythe. paWllQ until the said pawl falls i into the next space j'b etwe'en points;

The. new stylus, pointis now in operative operation 'i'srep'eated 'asioften asit is des red to usea new'polnt until all have been used and the tooth provided with the notch 23'h'asbeen brought aroundlto the position 'where the hook 22 on paWlflQ engages with the notch 23 and locks the" needle Wheel 11 against further rotation; This inakes the operator aware that all the points have been used and'that a new needle wheelshould be inserted, It will be evident from the above that jlightjis not necessary in changing points, the sense i of touch and the click of the pawl in'passing fi'o inone space between teeth to] another being suificientguides fo "the operation. y i v s V WhilejI have described a specificconin the diawing, I do not Wish'to be limited to. such construction asit is evident that nu merous departures :may ;;be niadei in' the 1: means, employed 'WllZhQlll) "departlng' from the spirit of this invention;

, Having described my mammal claiin 1. In a stylus-for sound feproducing"n1achinesythe combination of a member having a multiplicity of stylus points,supporting' struction in the foregoingispecification :7

and locking means' adapted .to'fhold said said stylus points of saidineinbe will be in operative position at'. any timefineans form bring ng a new stylus point of saldmembe-r" 'n embeirin' such position thatconly oneof into operative positon at will and ineansfil or preventing the bringing of a new stylus 7 po nt of said member nitoopei'ative pos 1 tion when all of Sitl'fl stylus member have been in use: i 7

will and means fonpreyentingsai'd turning u been in use."

, after all, of the teeth of said star w vheel have" 7 cnARLns-H; 

